摘要
This paper investigates a multibifurcated piezoelectric energy harvester(MBPEH)with coupled bending and torsional vibrations to enhance energy harvesting performance.A theoretical model is established and verified by the finite element method(FEM)and experimental results.The results show that the theoretical results show good performance with the FEM and experiments in both the output amplitude and response frequency bands.In addition,the multimodal response mechanism of the MBPEH is revealed.The influence of the bifurcated angle and the length of the bifurcated beams on the energy harvesting performance are deeply analyzed.Furthermore,it is revealed that the asymmetry of the bifurcated beams is conducive to energy harvesting.The Y-shaped(two bifurcated beams)MBPEH works in bending and axial mode(BAM),and bending and torsional mode(BTM)are compared,and the results show that the Y-shaped BTM-MBPEH has a better energy harvesting performance in mediumfrequency and lowfrequency bands.
本文研究了具有弯扭耦合及扭转振动的多分贫压电能量采集器(MBPEH),以提高能量采集器的性能,建立理论模型,并用有限元法和实验结果进行了验证.结果表明,理论计算结果与有限元计算结果和实验结果在输出幅度和响应频带上都具有良好的一致性,此外还揭示了MBPEH的多模态响应机理,深入分析分岔角度和分盆梁长度对能量收集性能的影响,还发现分叉梁的不对称性有利于能量收集.比较了Y型(两个分盆梁)MBPEH工作在弯曲和轴向模式(BAM)以及弯曲和扭转模式(BTM)下的性能,结果表明Y型BTM-MBPEH在中低频段具有更好的能量收集性能.
基金
supported by the National Natural Science Foundation of China(Grant Nos.12072267 and 11802237)
the 111 Project(Grant No.BP0719007).
